| Shareholder Report | 12 Months Ended |
| Oct. 31, 2024 USD ($) Holding |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Vanguard Municipal Bond Funds |
| Entity Central Index Key | 0000225997 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| C000007950 | |
| Shareholder Report [Line Items] | |
| Fund Name | High-Yield Tax-Exempt Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VWALX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard High-Yield Tax-Exempt Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Admiral Shares $10 0.09% |
| Expenses Paid, Amount | $ 10 |
| Expense Ratio, Percent | 0.09% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund outperformed its benchmark, the Bloomberg Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. The Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, U.S. investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a very strong performance. In late 2023, they rallied as inflation continued to fall and economic data weakened. And in the summer and early fall, cooling consumer prices and the Fed’s move to loosen monetary policy led to more gains. The biggest contributor to the Fund’s outperformance was an overweight to credit through high-yield, BBB-rated, and A-rated bonds. Sector allocation and security selection also added value, while overall duration detracted. |
| Line Graph [Table Text Block] | Admiral Shares Bloomberg Municipal Bond Index 2014 $50,000 $50,000 2015 $51,546 $51,231 2015 $50,929 $50,583 2015 $51,010 $50,762 2015 $51,779 $51,434 2016 $53,250 $52,621 2016 $54,162 $53,260 2016 $55,707 $54,287 2016 $55,018 $53,521 2017 $53,434 $52,474 2017 $54,529 $53,337 2017 $55,995 $54,426 2017 $56,673 $54,694 2018 $56,716 $54,323 2018 $56,644 $54,167 2018 $57,601 $54,967 2018 $56,915 $54,414 2019 $58,566 $56,096 2019 $60,519 $57,503 2019 $62,275 $58,983 2019 $63,118 $59,539 2020 $64,813 $60,946 2020 $60,159 $58,746 2020 $65,070 $62,143 2020 $64,974 $61,679 2021 $67,819 $63,392 2021 $68,162 $63,296 2021 $69,795 $64,187 2021 $68,801 $63,305 2022 $67,806 $62,196 2022 $62,706 $58,306 2022 $63,809 $59,741 2022 $58,233 $55,721 2023 $63,867 $60,175 2023 $63,658 $59,982 2023 $64,178 $60,295 2023 $60,042 $57,195 2024 $66,797 $61,921 2024 $66,359 $61,231 2024 $68,461 $62,552 2024 $68,794 $62,740 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 14.58% 1.74% 3.24% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| AssetsNet | $ 16,137,000,000 |
| Holdings Count | Holding | 3,354 |
| Advisory Fees Paid, Amount | $ 1,542,000 |
| InvestmentCompanyPortfolioTurnover | 29% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $16,137 Number of Portfolio Holdings 3,354 Portfolio Turnover Rate 29% Total Investment Advisory Fees (in thousands) $1,542 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 1.6% 1 to 3 Years 3.5% 3 to 5 Years 4.8% 5 to 10 Years 14.3% 10 to 20 Years 29.2% 20 to 30 Years 33.4% Greater than 30 Years 9.4% Other Assets and Liabilities—Net 3.8% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007949 | |
| Shareholder Report [Line Items] | |
| Fund Name | High-Yield Tax-Exempt Fund |
| Class Name | Investor Shares |
| Trading Symbol | VWAHX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard High-Yield Tax-Exempt Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Shares $18 0.17% |
| Expenses Paid, Amount | $ 18 |
| Expense Ratio, Percent | 0.17% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund outperformed its benchmark, the Bloomberg Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. The Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, U.S. investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a very strong performance. In late 2023, they rallied as inflation continued to fall and economic data weakened. And in the summer and early fall, cooling consumer prices and the Fed’s move to loosen monetary policy led to more gains. The biggest contributor to the Fund’s outperformance was an overweight to credit through high-yield, BBB-rated, and A-rated bonds. Sector allocation and security selection also added value, while overall duration detracted. |
| Line Graph [Table Text Block] | Investor Shares Bloomberg Municipal Bond Index 2014 $10,000 $10,000 2015 $10,307 $10,246 2015 $10,182 $10,117 2015 $10,196 $10,152 2015 $10,347 $10,287 2016 $10,639 $10,524 2016 $10,819 $10,652 2016 $11,125 $10,857 2016 $10,984 $10,704 2017 $10,665 $10,495 2017 $10,881 $10,667 2017 $11,171 $10,885 2017 $11,303 $10,939 2018 $11,309 $10,865 2018 $11,292 $10,833 2018 $11,481 $10,993 2018 $11,342 $10,883 2019 $11,669 $11,219 2019 $12,056 $11,501 2019 $12,403 $11,797 2019 $12,569 $11,908 2020 $12,904 $12,189 2020 $11,975 $11,749 2020 $12,949 $12,429 2020 $12,928 $12,336 2021 $13,491 $12,678 2021 $13,557 $12,659 2021 $13,879 $12,838 2021 $13,678 $12,661 2022 $13,478 $12,439 2022 $12,462 $11,661 2022 $12,678 $11,948 2022 $11,568 $11,144 2023 $12,685 $12,035 2023 $12,641 $11,996 2023 $12,742 $12,059 2023 $11,918 $11,439 2024 $13,256 $12,384 2024 $13,167 $12,246 2024 $13,581 $12,510 2024 $13,644 $12,548 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Investor Shares 14.49% 1.66% 3.16% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| AssetsNet | $ 16,137,000,000 |
| Holdings Count | Holding | 3,354 |
| Advisory Fees Paid, Amount | $ 1,542,000 |
| InvestmentCompanyPortfolioTurnover | 29% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $16,137 Number of Portfolio Holdings 3,354 Portfolio Turnover Rate 29% Total Investment Advisory Fees (in thousands) $1,542 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 1.6% 1 to 3 Years 3.5% 3 to 5 Years 4.8% 5 to 10 Years 14.3% 10 to 20 Years 29.2% 20 to 30 Years 33.4% Greater than 30 Years 9.4% Other Assets and Liabilities—Net 3.8% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007954 | |
| Shareholder Report [Line Items] | |
| Fund Name | Intermediate-Term Tax-Exempt Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VWIUX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Intermediate-Term Tax-Exempt Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Admiral Shares $9 0.09% |
| Expenses Paid, Amount | $ 9 |
| Expense Ratio, Percent | 0.09% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund outperformed its benchmark, the Bloomberg 1-15 Year Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. The Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a strong performance, rallying in late 2023 and again in the summer and early fall amid signs of progress on inflation and the prospect of looser monetary policy. The biggest contributor to the Fund’s outperformance was an overweight to credit through high-yield, BBB-rated, and A-rated bonds. Our allocation to 3% coupon bonds and positive security selection, especially in AA-rated bonds, added value. Overall duration and curve positioning were also positive. |
| Line Graph [Table Text Block] | Admiral Shares Bloomberg 1-15 Year Municipal Bond Index Bloomberg Municipal Bond Index 2014 $50,000 $50,000 $50,000 2015 $51,051 $50,949 $51,231 2015 $50,466 $50,422 $50,583 2015 $50,600 $50,581 $50,762 2015 $51,263 $51,230 $51,434 2016 $52,438 $52,218 $52,621 2016 $52,950 $52,675 $53,260 2016 $53,728 $53,423 $54,287 2016 $53,175 $52,817 $53,521 2017 $52,140 $51,975 $52,474 2017 $52,995 $52,784 $53,337 2017 $53,903 $53,661 $54,426 2017 $54,166 $53,841 $54,694 2018 $53,707 $53,377 $54,323 2018 $53,505 $53,215 $54,167 2018 $54,245 $53,981 $54,967 2018 $53,777 $53,555 $54,414 2019 $55,442 $55,162 $56,096 2019 $56,621 $56,187 $57,503 2019 $58,052 $57,554 $58,983 2019 $58,474 $57,901 $59,539 2020 $59,704 $59,111 $60,946 2020 $57,785 $57,516 $58,746 2020 $60,902 $60,324 $62,143 2020 $60,680 $60,020 $61,679 2021 $62,151 $61,265 $63,392 2021 $62,079 $61,157 $63,296 2021 $62,788 $61,771 $64,187 2021 $62,101 $61,088 $63,305 2022 $61,046 $59,998 $62,196 2022 $57,756 $56,999 $58,306 2022 $59,105 $58,596 $59,741 2022 $55,895 $55,624 $55,721 2023 $59,766 $59,143 $60,175 2023 $59,654 $58,992 $59,982 2023 $59,766 $59,144 $60,295 2023 $57,445 $56,998 $57,195 2024 $61,648 $60,649 $61,921 2024 $61,120 $60,083 $61,231 2024 $62,325 $61,035 $62,552 2024 $62,585 $61,290 $62,740 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 8.95% 1.37% 2.27% Bloomberg 1-15 Year Municipal Bond Index 7.53% 1.14% 2.06% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| AssetsNet | $ 76,016,000,000 |
| Holdings Count | Holding | 14,035 |
| Advisory Fees Paid, Amount | $ 7,199,000 |
| InvestmentCompanyPortfolioTurnover | 31% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $76,016 Number of Portfolio Holdings 14,035 Portfolio Turnover Rate 31% Total Investment Advisory Fees (in thousands) $7,199 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 2.7% 1 to 3 Years 6.2% 3 to 5 Years 7.5% 5 to 10 Years 23.0% 10 to 20 Years 46.3% 20 to 30 Years 10.2% Greater than 30 Years 2.9% Other Assets and Liabilities—Net 1.2% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007953 | |
| Shareholder Report [Line Items] | |
| Fund Name | Intermediate-Term Tax-Exempt Fund |
| Class Name | Investor Shares |
| Trading Symbol | VWITX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Intermediate-Term Tax-Exempt Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Shares $18 0.17% |
| Expenses Paid, Amount | $ 18 |
| Expense Ratio, Percent | 0.17% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund outperformed its benchmark, the Bloomberg 1-15 Year Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. The Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a strong performance, rallying in late 2023 and again in the summer and early fall amid signs of progress on inflation and the prospect of looser monetary policy. The biggest contributor to the Fund’s outperformance was an overweight to credit through high-yield, BBB-rated, and A-rated bonds. Our allocation to 3% coupon bonds and positive security selection, especially in AA-rated bonds, added value. Overall duration and curve positioning were also positive. |
| Line Graph [Table Text Block] | Investor Shares Bloomberg 1-15 Year Municipal Bond Index Bloomberg Municipal Bond Index 2014 $10,000 $10,000 $10,000 2015 $10,208 $10,190 $10,246 2015 $10,089 $10,084 $10,117 2015 $10,114 $10,116 $10,152 2015 $10,244 $10,246 $10,287 2016 $10,477 $10,444 $10,524 2016 $10,577 $10,535 $10,652 2016 $10,730 $10,685 $10,857 2016 $10,616 $10,563 $10,704 2017 $10,407 $10,395 $10,495 2017 $10,575 $10,557 $10,667 2017 $10,753 $10,732 $10,885 2017 $10,803 $10,768 $10,939 2018 $10,709 $10,675 $10,865 2018 $10,666 $10,643 $10,833 2018 $10,812 $10,796 $10,993 2018 $10,717 $10,711 $10,883 2019 $11,047 $11,032 $11,219 2019 $11,279 $11,237 $11,501 2019 $11,562 $11,511 $11,797 2019 $11,644 $11,580 $11,908 2020 $11,886 $11,822 $12,189 2020 $11,502 $11,503 $11,749 2020 $12,120 $12,065 $12,429 2020 $12,073 $12,004 $12,336 2021 $12,363 $12,253 $12,678 2021 $12,347 $12,231 $12,659 2021 $12,485 $12,354 $12,838 2021 $12,346 $12,218 $12,661 2022 $12,134 $12,000 $12,439 2022 $11,478 $11,400 $11,661 2022 $11,744 $11,719 $11,948 2022 $11,103 $11,125 $11,144 2023 $11,870 $11,829 $12,035 2023 $11,846 $11,798 $11,996 2023 $11,865 $11,829 $12,059 2023 $11,402 $11,400 $11,439 2024 $12,234 $12,130 $12,384 2024 $12,127 $12,017 $12,246 2024 $12,364 $12,207 $12,510 2024 $12,413 $12,258 $12,548 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Investor Shares 8.86% 1.29% 2.18% Bloomberg 1-15 Year Municipal Bond Index 7.53% 1.14% 2.06% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| AssetsNet | $ 76,016,000,000 |
| Holdings Count | Holding | 14,035 |
| Advisory Fees Paid, Amount | $ 7,199,000 |
| InvestmentCompanyPortfolioTurnover | 31% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $76,016 Number of Portfolio Holdings 14,035 Portfolio Turnover Rate 31% Total Investment Advisory Fees (in thousands) $7,199 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 2.7% 1 to 3 Years 6.2% 3 to 5 Years 7.5% 5 to 10 Years 23.0% 10 to 20 Years 46.3% 20 to 30 Years 10.2% Greater than 30 Years 2.9% Other Assets and Liabilities—Net 1.2% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007956 | |
| Shareholder Report [Line Items] | |
| Fund Name | Limited-Term Tax-Exempt Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VMLUX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Limited-Term Tax-Exempt Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Admiral Shares $9 0.09% |
| Expenses Paid, Amount | $ 9 |
| Expense Ratio, Percent | 0.09% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund outperformed its benchmark, the Bloomberg 1-5 Year Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. The Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, U.S. investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a very strong performance. In late 2023, they rallied as inflation continued to fall and economic data weakened, leading the markets to presume that interest rates had peaked. And in the summer and early fall, cooling consumer prices and the Fed’s move to loosen monetary policy led to more gains. The biggest contributor to the Fund’s outperformance was an overweight to credit through high-yield, BBB-rated, and A-rated bonds. |
| Line Graph [Table Text Block] | Admiral Shares Bloomberg 1-5 Year Municipal Bond Index Bloomberg Municipal Bond Index 2014 $50,000 $50,000 $50,000 2015 $50,384 $50,333 $51,231 2015 $50,127 $50,124 $50,583 2015 $50,237 $50,295 $50,762 2015 $50,617 $50,697 $51,434 2016 $50,999 $51,005 $52,621 2016 $51,151 $51,187 $53,260 2016 $51,542 $51,569 $54,287 2016 $51,331 $51,249 $53,521 2017 $50,935 $51,008 $52,474 2017 $51,419 $51,505 $53,337 2017 $51,862 $51,912 $54,426 2017 $51,931 $51,926 $54,694 2018 $51,637 $51,630 $54,323 2018 $51,533 $51,437 $54,167 2018 $52,111 $52,110 $54,967 2018 $51,931 $51,842 $54,414 2019 $52,873 $52,834 $56,096 2019 $53,428 $53,302 $57,503 2019 $54,282 $54,271 $58,983 2019 $54,445 $54,383 $59,539 2020 $55,093 $55,053 $60,946 2020 $54,257 $54,380 $58,746 2020 $56,040 $56,035 $62,143 2020 $56,065 $56,005 $61,679 2021 $56,678 $56,485 $63,392 2021 $56,678 $56,493 $63,296 2021 $56,962 $56,734 $64,187 2021 $56,672 $56,459 $63,305 2022 $56,019 $55,583 $62,196 2022 $54,472 $53,880 $58,306 2022 $55,502 $55,140 $59,741 2022 $53,910 $53,319 $55,721 2023 $55,952 $55,334 $60,175 2023 $55,858 $55,105 $59,982 2023 $56,032 $55,244 $60,295 2023 $55,388 $54,489 $57,195 2024 $57,452 $56,459 $61,921 2024 $57,426 $56,193 $61,231 2024 $58,324 $57,043 $62,552 2024 $58,862 $57,550 $62,740 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 6.27% 1.57% 1.65% Bloomberg 1-5 Year Municipal Bond Index 5.62% 1.14% 1.42% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| AssetsNet | $ 30,272,000,000 |
| Holdings Count | Holding | 7,177 |
| Advisory Fees Paid, Amount | $ 2,927,000 |
| InvestmentCompanyPortfolioTurnover | 50% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $30,272 Number of Portfolio Holdings 7,177 Portfolio Turnover Rate 50% Total Investment Advisory Fees (in thousands) $2,927 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 16.9% 1 to 3 Years 24.5% 3 to 5 Years 22.9% 5 to 10 Years 27.5% 10 to 20 Years 2.0% 20 to 30 Years 4.7% Greater than 30 Years 0.6% Other Assets and Liabilities—Net 0.9% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007955 | |
| Shareholder Report [Line Items] | |
| Fund Name | Limited-Term Tax-Exempt Fund |
| Class Name | Investor Shares |
| Trading Symbol | VMLTX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Limited-Term Tax-Exempt Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Shares $18 0.17% |
| Expenses Paid, Amount | $ 18 |
| Expense Ratio, Percent | 0.17% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund outperformed its benchmark, the Bloomberg 1-5 Year Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. The Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, U.S. investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a very strong performance. In late 2023, they rallied as inflation continued to fall and economic data weakened, leading the markets to presume that interest rates had peaked. And in the summer and early fall, cooling consumer prices and the Fed’s move to loosen monetary policy led to more gains. The biggest contributor to the Fund’s outperformance was an overweight to credit through high-yield, BBB-rated, and A-rated bonds. |
| Line Graph [Table Text Block] | Investor Shares Bloomberg 1-5 Year Municipal Bond Index Bloomberg Municipal Bond Index 2014 $10,000 $10,000 $10,000 2015 $10,075 $10,067 $10,246 2015 $10,022 $10,025 $10,117 2015 $10,042 $10,059 $10,152 2015 $10,115 $10,139 $10,287 2016 $10,189 $10,201 $10,524 2016 $10,218 $10,237 $10,652 2016 $10,293 $10,314 $10,857 2016 $10,248 $10,250 $10,704 2017 $10,166 $10,202 $10,495 2017 $10,260 $10,301 $10,667 2017 $10,346 $10,382 $10,885 2017 $10,357 $10,385 $10,939 2018 $10,296 $10,326 $10,865 2018 $10,273 $10,287 $10,833 2018 $10,386 $10,422 $10,993 2018 $10,349 $10,368 $10,883 2019 $10,535 $10,567 $11,219 2019 $10,643 $10,660 $11,501 2019 $10,811 $10,854 $11,797 2019 $10,841 $10,877 $11,908 2020 $10,968 $11,011 $12,189 2020 $10,799 $10,876 $11,749 2020 $11,152 $11,207 $12,429 2020 $11,155 $11,201 $12,336 2021 $11,275 $11,297 $12,678 2021 $11,272 $11,299 $12,659 2021 $11,327 $11,347 $12,838 2021 $11,267 $11,292 $12,661 2022 $11,135 $11,117 $12,439 2022 $10,825 $10,776 $11,661 2022 $11,027 $11,028 $11,948 2022 $10,709 $10,664 $11,144 2023 $11,112 $11,067 $12,035 2023 $11,092 $11,021 $11,996 2023 $11,124 $11,049 $12,059 2023 $10,994 $10,898 $11,439 2024 $11,401 $11,292 $12,384 2024 $11,394 $11,239 $12,246 2024 $11,570 $11,409 $12,510 2024 $11,674 $11,510 $12,548 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Investor Shares 6.19% 1.49% 1.56% Bloomberg 1-5 Year Municipal Bond Index 5.62% 1.14% 1.42% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| AssetsNet | $ 30,272,000,000 |
| Holdings Count | Holding | 7,177 |
| Advisory Fees Paid, Amount | $ 2,927,000 |
| InvestmentCompanyPortfolioTurnover | 50% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $30,272 Number of Portfolio Holdings 7,177 Portfolio Turnover Rate 50% Total Investment Advisory Fees (in thousands) $2,927 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 16.9% 1 to 3 Years 24.5% 3 to 5 Years 22.9% 5 to 10 Years 27.5% 10 to 20 Years 2.0% 20 to 30 Years 4.7% Greater than 30 Years 0.6% Other Assets and Liabilities—Net 0.9% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007958 | |
| Shareholder Report [Line Items] | |
| Fund Name | Long-Term Tax-Exempt Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VWLUX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Long-Term Tax-Exempt Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Admiral Shares $10 0.09% |
| Expenses Paid, Amount | $ 10 |
| Expense Ratio, Percent | 0.09% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund outperformed its benchmark, the Bloomberg Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. The Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, U.S. investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a very strong performance. In late 2023, they rallied as inflation continued to fall and economic data weakened. And in the summer and early fall, cooling consumer prices and the Fed’s move to loosen monetary policy led to more gains. The biggest contributor to the Fund’s outperformance was an overweight to credit through high-yield, BBB-rated, and A-rated bonds. Sector allocation, coupon and call allocations, and security selection also added value, while overall duration detracted. |
| Line Graph [Table Text Block] | Admiral Shares Bloomberg Municipal Bond Index 2014 $50,000 $50,000 2015 $51,451 $51,231 2015 $50,708 $50,583 2015 $50,933 $50,762 2015 $51,635 $51,434 2016 $53,171 $52,621 2016 $54,006 $53,260 2016 $55,222 $54,287 2016 $54,473 $53,521 2017 $53,112 $52,474 2017 $54,055 $53,337 2017 $55,302 $54,426 2017 $55,790 $54,694 2018 $55,610 $54,323 2018 $55,359 $54,167 2018 $56,195 $54,967 2018 $55,503 $54,414 2019 $57,333 $56,096 2019 $59,027 $57,503 2019 $60,735 $58,983 2019 $61,467 $59,539 2020 $63,041 $60,946 2020 $60,271 $58,746 2020 $64,359 $62,143 2020 $64,014 $61,679 2021 $66,148 $63,392 2021 $66,158 $63,296 2021 $67,353 $64,187 2021 $66,417 $63,305 2022 $65,364 $62,196 2022 $60,564 $58,306 2022 $61,845 $59,741 2022 $56,992 $55,721 2023 $62,349 $60,175 2023 $62,097 $59,982 2023 $62,368 $60,295 2023 $58,513 $57,195 2024 $64,739 $61,921 2024 $63,924 $61,231 2024 $65,685 $62,552 2024 $65,896 $62,740 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 12.62% 1.40% 2.80% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| AssetsNet | $ 17,706,000,000 |
| Holdings Count | Holding | 3,732 |
| Advisory Fees Paid, Amount | $ 1,713,000 |
| InvestmentCompanyPortfolioTurnover | 28% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $17,706 Number of Portfolio Holdings 3,732 Portfolio Turnover Rate 28% Total Investment Advisory Fees (in thousands) $1,713 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 1.1% 1 to 3 Years 1.0% 3 to 5 Years 1.8% 5 to 10 Years 9.2% 10 to 20 Years 36.3% 20 to 30 Years 39.9% Greater than 30 Years 7.3% Other Assets and Liabilities—Net 3.4% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007957 | |
| Shareholder Report [Line Items] | |
| Fund Name | Long-Term Tax-Exempt Fund |
| Class Name | Investor Shares |
| Trading Symbol | VWLTX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Long-Term Tax-Exempt Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Shares $18 0.17% |
| Expenses Paid, Amount | $ 18 |
| Expense Ratio, Percent | 0.17% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund outperformed its benchmark, the Bloomberg Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. The Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, U.S. investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a very strong performance. In late 2023, they rallied as inflation continued to fall and economic data weakened. And in the summer and early fall, cooling consumer prices and the Fed’s move to loosen monetary policy led to more gains. The biggest contributor to the Fund’s outperformance was an overweight to credit through high-yield, BBB-rated, and A-rated bonds. Sector allocation, coupon and call allocations, and security selection also added value, while overall duration detracted. |
| Line Graph [Table Text Block] | Investor Shares Bloomberg Municipal Bond Index 2014 $10,000 $10,000 2015 $10,288 $10,246 2015 $10,138 $10,117 2015 $10,181 $10,152 2015 $10,319 $10,287 2016 $10,624 $10,524 2016 $10,788 $10,652 2016 $11,028 $10,857 2016 $10,875 $10,704 2017 $10,601 $10,495 2017 $10,786 $10,667 2017 $11,032 $10,885 2017 $11,127 $10,939 2018 $11,088 $10,865 2018 $11,036 $10,833 2018 $11,200 $10,993 2018 $11,061 $10,883 2019 $11,423 $11,219 2019 $11,759 $11,501 2019 $12,096 $11,797 2019 $12,240 $11,908 2020 $12,551 $12,189 2020 $11,997 $11,749 2020 $12,808 $12,429 2020 $12,737 $12,336 2021 $13,159 $12,678 2021 $13,158 $12,659 2021 $13,393 $12,838 2021 $13,204 $12,661 2022 $12,992 $12,439 2022 $12,036 $11,661 2022 $12,288 $11,948 2022 $11,321 $11,144 2023 $12,383 $12,035 2023 $12,331 $11,996 2023 $12,382 $12,059 2023 $11,614 $11,439 2024 $12,847 $12,384 2024 $12,683 $12,246 2024 $13,030 $12,510 2024 $13,069 $12,548 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Investor Shares 12.53% 1.32% 2.71% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| AssetsNet | $ 17,706,000,000 |
| Holdings Count | Holding | 3,732 |
| Advisory Fees Paid, Amount | $ 1,713,000 |
| InvestmentCompanyPortfolioTurnover | 28% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $17,706 Number of Portfolio Holdings 3,732 Portfolio Turnover Rate 28% Total Investment Advisory Fees (in thousands) $1,713 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 1.1% 1 to 3 Years 1.0% 3 to 5 Years 1.8% 5 to 10 Years 9.2% 10 to 20 Years 36.3% 20 to 30 Years 39.9% Greater than 30 Years 7.3% Other Assets and Liabilities—Net 3.4% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007960 | |
| Shareholder Report [Line Items] | |
| Fund Name | Ultra-Short-Term Tax-Exempt Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VWSUX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Ultra-Short-Term Tax-Exempt Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Admiral Shares $9 0.09% |
| Expenses Paid, Amount | $ 9 |
| Expense Ratio, Percent | 0.09% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund outperformed its benchmark, the Bloomberg 1 Year Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. The Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, U.S. investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a very strong performance. In late 2023, they rallied as inflation continued to fall and economic data weakened. And in the summer and early fall, cooling consumer prices and the Fed’s move to loosen monetary policy led to more gains. The biggest contributor to the Fund’s outperformance was an overweight to credit through high-yield, BBB-rated, and A-rated bonds. Having a relatively long duration stance and shifting exposure from floating-rate securities to fixed-rate securities also added value. |
| Line Graph [Table Text Block] | Admiral Shares Bloomberg 1 Year Municipal Bond Index Bloomberg Municipal Bond Index 2014 $50,000 $50,000 $50,000 2015 $50,096 $50,098 $51,231 2015 $50,064 $50,117 $50,583 2015 $50,135 $50,183 $50,762 2015 $50,295 $50,379 $51,434 2016 $50,397 $50,463 $52,621 2016 $50,505 $50,527 $53,260 2016 $50,725 $50,728 $54,287 2016 $50,668 $50,580 $53,521 2017 $50,640 $50,643 $52,474 2017 $50,906 $50,890 $53,337 2017 $51,118 $51,064 $54,426 2017 $51,202 $51,123 $54,694 2018 $51,144 $51,067 $54,323 2018 $51,190 $51,071 $54,167 2018 $51,575 $51,526 $54,967 2018 $51,589 $51,455 $54,414 2019 $52,075 $51,971 $56,096 2019 $52,366 $52,270 $57,503 2019 $52,861 $52,800 $58,983 2019 $53,012 $52,916 $59,539 2020 $53,380 $53,273 $60,946 2020 $53,128 $53,238 $58,746 2020 $53,972 $53,898 $62,143 2020 $54,042 $53,904 $61,679 2021 $54,262 $54,108 $63,392 2021 $54,302 $54,167 $63,296 2021 $54,397 $54,254 $64,187 2021 $54,308 $54,175 $63,305 2022 $54,008 $53,827 $62,196 2022 $53,358 $53,096 $58,306 2022 $53,909 $53,805 $59,741 2022 $53,300 $52,987 $55,721 2023 $54,331 $54,021 $60,175 2023 $54,469 $53,983 $59,982 2023 $54,797 $54,297 $60,295 2023 $54,819 $54,281 $57,195 2024 $56,095 $55,371 $61,921 2024 $56,303 $55,459 $61,231 2024 $57,099 $56,275 $62,552 2024 $57,613 $56,680 $62,740 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 5.10% 1.68% 1.43% Bloomberg 1 Year Municipal Bond Index 4.42% 1.38% 1.26% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| AssetsNet | $ 14,432,000,000 |
| Holdings Count | Holding | 3,184 |
| Advisory Fees Paid, Amount | $ 1,487,000 |
| InvestmentCompanyPortfolioTurnover | 91% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $14,432 Number of Portfolio Holdings 3,184 Portfolio Turnover Rate 91% Total Investment Advisory Fees (in thousands) $1,487 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 32.2% 1 to 3 Years 35.8% 3 to 5 Years 18.9% 5 to 10 Years 4.9% 10 to 20 Years 3.2% 20 to 30 Years 3.9% Greater than 30 Years 0.5% Other Assets and Liabilities—Net 0.6% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007959 | |
| Shareholder Report [Line Items] | |
| Fund Name | Ultra-Short-Term Tax-Exempt Fund |
| Class Name | Investor Shares |
| Trading Symbol | VWSTX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Ultra-Short-Term Tax-Exempt Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Shares $17 0.17% |
| Expenses Paid, Amount | $ 17 |
| Expense Ratio, Percent | 0.17% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund outperformed its benchmark, the Bloomberg 1 Year Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. The Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, U.S. investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a very strong performance. In late 2023, they rallied as inflation continued to fall and economic data weakened. And in the summer and early fall, cooling consumer prices and the Fed’s move to loosen monetary policy led to more gains. The biggest contributor to the Fund’s outperformance was an overweight to credit through high-yield, BBB-rated, and A-rated bonds. Having a relatively long duration stance and shifting exposure from floating-rate securities to fixed-rate securities also added value. |
| Line Graph [Table Text Block] | Investor Shares Bloomberg 1 Year Municipal Bond Index Bloomberg Municipal Bond Index 2014 $10,000 $10,000 $10,000 2015 $10,017 $10,020 $10,246 2015 $10,009 $10,023 $10,117 2015 $10,021 $10,037 $10,152 2015 $10,051 $10,076 $10,287 2016 $10,069 $10,093 $10,524 2016 $10,089 $10,105 $10,652 2016 $10,130 $10,146 $10,857 2016 $10,115 $10,116 $10,704 2017 $10,107 $10,129 $10,495 2017 $10,158 $10,178 $10,667 2017 $10,198 $10,213 $10,885 2017 $10,212 $10,225 $10,939 2018 $10,198 $10,213 $10,865 2018 $10,204 $10,214 $10,833 2018 $10,279 $10,305 $10,993 2018 $10,281 $10,291 $10,883 2019 $10,376 $10,394 $11,219 2019 $10,432 $10,454 $11,501 2019 $10,528 $10,560 $11,797 2019 $10,556 $10,583 $11,908 2020 $10,627 $10,655 $12,189 2020 $10,575 $10,648 $11,749 2020 $10,741 $10,780 $12,429 2020 $10,752 $10,781 $12,336 2021 $10,794 $10,822 $12,678 2021 $10,800 $10,833 $12,659 2021 $10,817 $10,851 $12,838 2021 $10,797 $10,835 $12,661 2022 $10,735 $10,765 $12,439 2022 $10,604 $10,619 $11,661 2022 $10,711 $10,761 $11,948 2022 $10,588 $10,597 $11,144 2023 $10,790 $10,804 $12,035 2023 $10,816 $10,797 $11,996 2023 $10,879 $10,859 $12,059 2023 $10,881 $10,856 $11,439 2024 $11,132 $11,074 $12,384 2024 $11,171 $11,092 $12,246 2024 $11,327 $11,255 $12,510 2024 $11,426 $11,336 $12,548 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Investor Shares 5.01% 1.60% 1.34% Bloomberg 1 Year Municipal Bond Index 4.42% 1.38% 1.26% Bloomberg Municipal Bond Index 9.70% 1.05% 2.30% |
| AssetsNet | $ 14,432,000,000 |
| Holdings Count | Holding | 3,184 |
| Advisory Fees Paid, Amount | $ 1,487,000 |
| InvestmentCompanyPortfolioTurnover | 91% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $14,432 Number of Portfolio Holdings 3,184 Portfolio Turnover Rate 91% Total Investment Advisory Fees (in thousands) $1,487 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 32.2% 1 to 3 Years 35.8% 3 to 5 Years 18.9% 5 to 10 Years 4.9% 10 to 20 Years 3.2% 20 to 30 Years 3.9% Greater than 30 Years 0.5% Other Assets and Liabilities—Net 0.6% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007961 | |
| Shareholder Report [Line Items] | |
| Fund Name | Municipal Money Market Fund |
| Class Name | Investor Shares |
| Trading Symbol | VMSXX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Municipal Money Market Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Shares $15 0.15% |
| Expenses Paid, Amount | $ 15 |
| Expense Ratio, Percent | 0.15% |
| AssetsNet | $ 18,046,000,000 |
| Holdings Count | Holding | 917 |
| Advisory Fees Paid, Amount | $ 4,019,000 |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $18,046 Number of Portfolio Holdings 917 Total Investment Advisory Fees (in thousands) $4,019 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments and other assets and liabilities. Distribution by Effective Maturity % of Net Assets (as of October 31, 2024 1 to 7 Days 90.6% 8 to 30 Days 1.1% 31 to 60 Days 2.6% 61 to 90 Days 0.5% 91 to 180 Days 0.8% Over 180 Days 4.0% Other Assets and Liabilities—Net 0.4% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000153132 | |
| Shareholder Report [Line Items] | |
| Fund Name | Tax-Exempt Bond Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VTEB |
| Security Exchange Name | NYSE |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Tax-Exempt Bond Index Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. The report describes changes to the Fund that occurred during the reporting period. |
| Material Fund Change Notice [Text Block] | The report describes changes to the Fund that occurred during the reporting period. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment ETF Shares $5 0.05% |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund performed in line with its benchmark, the S&P National AMT-Free Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. In September 2024, the Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, U.S. investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a very strong performance. In late 2023, they rallied as inflation continued to fall and economic data weakened, leading the markets to presume that interest rates had peaked. And in the summer and early fall, cooling consumer prices and the Fed’s move to loosen monetary policy led to more gains. As a whole, revenue bonds returned a little more than general obligation bonds. Lower-quality and longer-dated bonds performed best. |
| Line Graph [Table Text Block] | ETF Shares Net Asset Value S&P National AMT-Free Municipal Bond Index Bloomberg Municipal Bond Index 8/21/15 $10,000 $10,000 $10,000 10/31/15 $10,085 $10,083 $10,095 1/31/16 $10,331 $10,326 $10,328 4/30/16 $10,450 $10,453 $10,453 7/31/16 $10,644 $10,645 $10,655 10/31/16 $10,518 $10,519 $10,504 1/31/17 $10,301 $10,299 $10,299 4/30/17 $10,454 $10,452 $10,468 7/31/17 $10,656 $10,655 $10,682 10/31/17 $10,717 $10,721 $10,735 1/31/18 $10,652 $10,662 $10,662 4/30/18 $10,593 $10,607 $10,631 7/31/18 $10,747 $10,764 $10,788 10/31/18 $10,626 $10,643 $10,680 1/31/19 $10,947 $10,962 $11,010 4/30/19 $11,215 $11,230 $11,238 7/31/19 $11,517 $11,529 $11,576 10/31/19 $11,621 $11,631 $11,686 1/31/20 $11,887 $11,893 $11,962 4/30/20 $11,464 $11,473 $11,530 7/31/20 $12,098 $12,103 $12,197 10/31/20 $12,014 $12,020 $12,106 1/31/21 $12,333 $12,340 $12,442 4/30/21 $12,316 $12,325 $12,423 7/31/21 $12,477 $12,492 $12,598 10/31/21 $12,326 $12,348 $12,425 1/31/22 $12,118 $12,143 $12,207 4/30/22 $11,395 $11,416 $11,444 7/31/22 $11,675 $11,693 $11,725 10/31/22 $10,932 $10,949 $10,936 1/31/23 $11,751 $11,782 $11,810 4/30/23 $11,720 $11,750 $11,772 7/31/23 $11,761 $11,795 $11,834 10/31/23 $11,184 $11,217 $11,225 1/31/24 $12,104 $12,139 $12,153 4/30/24 $11,953 $11,982 $12,018 7/31/24 $12,202 $12,236 $12,277 10/31/24 $12,246 $12,277 $12,314 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years Since Inception 8/21/15 ETF Shares Net Asset Value 9.50% 1.05% 2.23% ETF Shares Market Price 9.54% 1.06% 2.24% S&P National AMT-Free Municipal Bond Index 9.46% 1.09% 2.26% Bloomberg Municipal Bond Index Footnote Reference 9.70% 1.05% 2.29% Footnote Description Footnote * The Fund added a broad-based benchmark to reflect new regulatory requirements. The Bloomberg Municipal Bond Index is considered broadly representative of the overall securities market applicable to the Fund. |
| AssetsNet | $ 37,879,000,000 |
| Holdings Count | Holding | 10,209 |
| Advisory Fees Paid, Amount | $ 679,000 |
| InvestmentCompanyPortfolioTurnover | 19% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $37,879 Number of Portfolio Holdings 10,209 Portfolio Turnover Rate 19% Total Investment Advisory Fees (in thousands) $679 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 4.8% 1 to 3 Years 8.9% 3 to 5 Years 8.0% 5 to 10 Years 18.9% 10 to 20 Years 30.2% 20 to 30 Years 26.7% Greater than 30 Years 2.8% Other Assets and Liabilities—Net (0.3%) |
| Material Fund Change [Text Block] | How has the Fund changed? The Fund's principal investment strategy was modified to add that the Fund may become nondiversified under the Investment Company Act of 1940 solely as a result of an index rebalance or market movement. The Fund added nondiversification risk as a principal risk. This is a summary of certain changes to the Fund since October 31, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available by February 28, 2025 at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447. |
| Material Fund Change Strategies [Text Block] | The Fund's principal investment strategy was modified to add that the Fund may become nondiversified under the Investment Company Act of 1940 solely as a result of an index rebalance or market movement. The Fund added nondiversification risk as a principal risk. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since October 31, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available by February 28, 2025 at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447. |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000153131 | |
| Shareholder Report [Line Items] | |
| Fund Name | Tax-Exempt Bond Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VTEAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Tax-Exempt Bond Index Fund (the "Fund") for the period of November 1, 2023, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. The report describes changes to the Fund that occurred during the reporting period. |
| Material Fund Change Notice [Text Block] | The report describes changes to the Fund that occurred during the reporting period. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Admiral Shares $9 0.09% |
| Expenses Paid, Amount | $ 9 |
| Expense Ratio, Percent | 0.09% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended October 31, 2024, the Fund performed in line with its benchmark, the S&P National AMT-Free Municipal Bond Index. U.S. economic growth hovered around 3% on a year-over-year basis during the period, quelling recession fears. In September 2024, the Federal Reserve began cutting interest rates for the first time since early 2020, and the year-over-year rate of consumer price inflation eased to around 2.5%. Even with some negative monthly returns, U.S. investment-grade bonds posted strong gains for the fiscal year. Muni bonds turned in a very strong performance. In late 2023, they rallied as inflation continued to fall and economic data weakened, leading the markets to presume that interest rates had peaked. And in the summer and early fall, cooling consumer prices and the Fed’s move to loosen monetary policy led to more gains. As a whole, revenue bonds returned a little more than general obligation bonds. Lower-quality and longer-dated bonds performed best. |
| Line Graph [Table Text Block] | Admiral Shares S&P National AMT-Free Municipal Bond Index Bloomberg Municipal Bond Index 8/25/15 $10,000 $10,000 $10,000 10/31/15 $10,093 $10,093 $10,099 1/31/16 $10,340 $10,335 $10,332 4/30/16 $10,463 $10,463 $10,457 7/31/16 $10,656 $10,655 $10,659 10/31/16 $10,533 $10,528 $10,508 1/31/17 $10,316 $10,309 $10,303 4/30/17 $10,465 $10,462 $10,472 7/31/17 $10,672 $10,665 $10,686 10/31/17 $10,729 $10,731 $10,739 1/31/18 $10,665 $10,672 $10,666 4/30/18 $10,606 $10,617 $10,635 7/31/18 $10,761 $10,774 $10,792 10/31/18 $10,639 $10,653 $10,684 1/31/19 $10,960 $10,973 $11,014 4/30/19 $11,229 $11,240 $11,290 7/31/19 $11,533 $11,540 $11,581 10/31/19 $11,635 $11,642 $11,690 1/31/20 $11,901 $11,905 $11,966 4/30/20 $11,475 $11,484 $11,534 7/31/20 $12,108 $12,114 $12,201 10/31/20 $12,021 $12,031 $12,110 1/31/21 $12,343 $12,352 $12,447 4/30/21 $12,324 $12,336 $12,428 7/31/21 $12,485 $12,504 $12,603 10/31/21 $12,329 $12,359 $12,429 1/31/22 $12,122 $12,154 $12,212 4/30/22 $11,398 $11,427 $11,448 7/31/22 $11,675 $11,704 $11,730 10/31/22 $10,931 $10,960 $10,940 1/31/23 $11,749 $11,793 $11,815 4/30/23 $11,719 $11,761 $11,777 7/31/23 $11,759 $11,806 $11,839 10/31/23 $11,178 $11,227 $11,230 1/31/24 $12,096 $12,151 $12,158 4/30/24 $11,943 $11,994 $12,022 7/31/24 $12,193 $12,248 $12,282 10/31/24 $12,239 $12,289 $12,319 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years Since Inception 8/25/15 Admiral Shares 9.49% 1.02% 2.22% S&P National AMT-Free Municipal Bond Index 9.46% 1.09% 2.27% Bloomberg Municipal Bond Index Footnote Reference 9.70% 1.05% 2.30% Footnote Description Footnote * The Fund added a broad-based benchmark to reflect new regulatory requirements. The Bloomberg Municipal Bond Index is considered broadly representative of the overall securities market applicable to the Fund. |
| AssetsNet | $ 37,879,000,000 |
| Holdings Count | Holding | 10,209 |
| Advisory Fees Paid, Amount | $ 679,000 |
| InvestmentCompanyPortfolioTurnover | 19% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $37,879 Number of Portfolio Holdings 10,209 Portfolio Turnover Rate 19% Total Investment Advisory Fees (in thousands) $679 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 4.8% 1 to 3 Years 8.9% 3 to 5 Years 8.0% 5 to 10 Years 18.9% 10 to 20 Years 30.2% 20 to 30 Years 26.7% Greater than 30 Years 2.8% Other Assets and Liabilities—Net (0.3%) |
| Material Fund Change [Text Block] | How has the Fund changed? The Fund's principal investment strategy was modified to add that the Fund may become nondiversified under the Investment Company Act of 1940 solely as a result of an index rebalance or market movement. The Fund added nondiversification risk as a principal risk. This is a summary of certain changes to the Fund since October 31, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available by February 28, 2025 at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447. |
| Material Fund Change Strategies [Text Block] | The Fund's principal investment strategy was modified to add that the Fund may become nondiversified under the Investment Company Act of 1940 solely as a result of an index rebalance or market movement. The Fund added nondiversification risk as a principal risk. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since October 31, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available by February 28, 2025 at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447. |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000247740 | |
| Shareholder Report [Line Items] | |
| Fund Name | Intermediate-Term Tax-Exempt Bond ETF |
| Class Name | ETF Shares |
| Trading Symbol | VTEI |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Intermediate-Term Tax-Exempt Bond ETF (the "Fund") for the period of January 26, 2024, to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. The report describes changes to the Fund that occurred during the reporting period. |
| Material Fund Change Notice [Text Block] | The report describes changes to the Fund that occurred during the reporting period. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment ETF Shares $6 0.08% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.08% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? From its inception on January 26 through October 31, 2024, the Fund performed roughly in line with its benchmark, the S&P Intermediate Term National AMT-Free Municipal Bond Index. The Fund seeks to track the performance of a benchmark index that measures the investment-grade segment of the U.S. municipal bond market with remaining maturities between one month and twenty years. Even with some negative monthly returns, investment-grade bonds posted strong gains for the fiscal period. Muni bonds returned less than their taxable counterparts. Enthusiasm for munis and fixed-income securities in general waned in early 2024, owing in part to the expected timeline for interest rate cuts getting pushed back. |
| Line Graph [Table Text Block] | ETF Shares Net Asset Value S&P Intermediate Term National AMT-Free Municipal Bond Index Bloomberg Municipal Bond Index 1/26/24 $10,000 $10,000 $10,000 2024 $10,146 $10,153 $10,193 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns Since Inception 1/26/24 ETF Shares Net Asset Value 1.46% ETF Shares Market Price 1.64% S&P Intermediate Term National AMT-Free Municipal Bond Index 1.53% Bloomberg Municipal Bond Index Footnote Reference 1.93% Footnote Description Footnote * The Fund added a broad-based benchmark to reflect new regulatory requirements. The Bloomberg Municipal Bond Index is considered broadly representative of the overall securities market applicable to the Fund. |
| AssetsNet | $ 274,000,000 |
| Holdings Count | Holding | 2,178 |
| Advisory Fees Paid, Amount | $ 2,000 |
| InvestmentCompanyPortfolioTurnover | 30% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of October 31, 2024 Fund Net Assets (in millions) $274 Number of Portfolio Holdings 2,178 Portfolio Turnover Rate 30% Total Investment Advisory Fees (in thousands) $2 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of October 31, 2024) Less than 1 Year 5.6% 1 to 3 Years 13.5% 3 to 5 Years 10.7% 5 to 10 Years 26.8% 10 to 20 Years 43.1% 20 to 30 Years 0.9% Other Assets and Liabilities—Net (0.6%) |
| Material Fund Change [Text Block] | How has the Fund changed? The Fund's principal investment strategy was modified to add that the Fund may become nondiversified under the Investment Company Act of 1940 solely as a result of an index rebalance or market movement. The Fund added nondiversification risk as a principal risk. This is a summary of certain changes to the Fund since January 26, 2024. For more complete information, you may review the Fund’s next prospectus, which we expect to be available by February 28, 2025 at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447. |
| Material Fund Change Strategies [Text Block] | The Fund's principal investment strategy was modified to add that the Fund may become nondiversified under the Investment Company Act of 1940 solely as a result of an index rebalance or market movement. The Fund added nondiversification risk as a principal risk. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since January 26, 2024. For more complete information, you may review the Fund’s next prospectus, which we expect to be available by February 28, 2025 at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447. |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
